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80th Percentile API Latency

A medium SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
medium
Seniority
mid

Interview Prompt

The performance engineering team is setting SLO thresholds for the API gateway. They need the latency value at the 80th percentile across all recorded API calls. Return a single value representing that threshold.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your sql solution with real code execution
  4. Get instant feedback and a hire/no-hire decision